Part 1: What It Is and What It Isn't
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A deep dive into pg_stat_statements, the built-in Postgres extension for tracking query performance. Covers how it stores data in an in-memory hash table, how to enable it, what its 45+ columns track, and critically what it does NOT provide: per-execution history, time-windowed data, or unlimited query tracking (default cap is 5,000 unique queries). Explains the cumulative metrics model and why misunderstanding these limitations can leave teams blind during performance incidents. Part 1 of a multi-episode series that will also cover query normalization, source code internals, configuration tuning, and high-cardinality workload strategies.
